Audio for DVD

I know this might be a bit off-topic, but since I'm a Logic Pro user, I thought it would be ok to ask this here:
Does anyone know the maximum level for audio used in a movie on DVD?
I once made a DVD with levels at a bit below 0dB and I heard some distortion. But it does not have to be at -9dB, does it?
Thanks in advance!

I once made a DVD with levels at a bit below 0dB and I heard some distortion.
where did you hear the distortion?
AFAIK there's no technical reason why you shouldn't go to 0dB. But keep in mind that when using AC3 the audio has to be compressed. And depending on the material and AC3-settings the distortion might have occured in that step.
cheers
Martin

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